Boundaries Gabriel garcia

Convergent Boundary- Convergent means coming closer together. When we talk about boundaries, it is where the plates come together and they collide. When the Oceanic plate collides with the Continental plate the more buoyant plate, and when it does this it is called Subduction. When 2 continental plates collide, they create landforms such as mountains and volcanoes. Convergent Boundaries move toward each other meaning they will compress against each other until the more buoyant plate will sink under the other plate. When a continent goes under another continent plate, it causes magma to erupt out of the mantle and and causes volcanoes to spew the hot magma from the Earth. Some famous mountains are Mount. Everest, Mount Fuji, Mount St. Helens. Some famous volcanoes are Cayambe, Chimborazo, Volcán de Colima. One of the worlds most famous trench is Marianas Trench. The Marianas Trench is the deepest point in the world, Mount. Everest being the tallest mountain in the world, and Yellowstone Caldera the most dangerous volcano in the world. On May 18, 1980, Mount St. Helens erupted in Washington. When it erupted it was an VEI 5 eruption, a very big eruption. The eruption threw ash and smoke everywhere for miles to see. The owner of a lodge in the mountains, Harry Randall Truman was killed in the eruption of Mount. St. Helens because he was to stubborn to leave his lodge and his body still lies in the mountains today.

Harry R. Truman in his lodge on Mount. St. Helens
Mount. Saint Helens
Mount Everest
Volcano
Mariana Islands

Transform Boundary- The way transform plates move is past each other, like a car drives right by another car on the street. This category of boundary the plates will slide horizontally away from each other. When that happens, earthquakes will occur when it spreads over the process of millions of years, fault lines are created. The most famous fault line in the world is the San Andreas Fault Zone in California, U.S.A. The fault line is about 800 miles long and is a mile wide and 10 feet deep. This type of boundary has shear stress. Shear stress is the stress which pulls one object in one direction and another object in the opposite direction. The most catastrophic earthquake ever recorded was in San Fransisco on the early morning of April 18, 1906. With a magnitude of 7.8 and a maximum of Mercalli intensity of XI. The Mercalli scale is a scale to measure how intense an earthquake is. The result of that earthquake that lasted only a minute but it caused horrible damage to the city by starting 7 major fires in the city that burned for over 3 days, also destroying over 500 blocks of city it was the most catastrophic disasters in U.S. history ever. The earthquake left over 400,000 people homeless, and almost over 3,000 people dead.

San Andreas Fault Line
House collapse after 1906 earthquakes
San Francisco before earthquake
A transform boundary
Mercalli intensity scale (Earthquake intensity scale)

Divergent Boundary- Divergent means to develop in different directions. Divergent plates spread, or move away from each other. When oceanic plates spread, lava spews from the mantle and new crust is being formed, but at the same time it's being formed, it is also being destroyed. The crust grows back as fast as an average humans fingernails grow. When they separate over millions of years, they created Mid-Ocean Ridges. Ridges are underwater mountains that form from cooled lava from the mantle. When a continent plate diverges, it can create rift valleys. Famous examples of rift valleys is the East African Rift. This formed 25 million years ago when the African plate spread from the Eurasian plate. This rift is 4,820 feet deep and is one of the more iconic attractions in Africa. A famous example of the ridges is the Mid-Atlantic Ridge. This underwater mountain scheme was created over 251 million years ago. The Mid-Atlantic Ridge is the longest mountain range in the world of about 10,000 miles. The ridge is also the deepest point in the world going down -25,453 feet. Earthquakes and volcanic eruptions are the only things that happen at these boundaries. An earthquake was recorded on February 8, 2017 near the Mid-Atlantic Ridge. This earthquake was a 7.0 magnitude and did not cause a tsunami to the surrounding areas.

Mid-Atlantic Ridge demonstration
Mid-Atlantic Ridge
East African Rift

Credits:

Created with images by LoggaWiggler - "lüner lake clouds mirroring" • pmlbird - "PML Convergent Boundary" • kiszka king - "blow_up_of_crater" • Mot the barber - "untitled image" • johncooke - "Volcano" • NASA Earth Observatory - "Pagan Island, Northern Marianas" • WorldIslandInfo.com - "Tectonic rift, Thingvellir, Iceland"

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